.section .text
.global _start
_start:
  csrw sstatus, 0x0000000000000000
  la sp, stack_top
  call kinit
  call test_physical_memory
  call test_pagetable
  call test_virtual_memory
loop:
  j loop

.section .bss
.align 12
stack:
  .space 4096 * 8
stack_top: